what do you need for school?中为什么要用for?

what do you need you need to do what seems right for you翻译 what do you need for your picnic?回答 I need to know what do you want for all? What do you need for your picnic?(回答怎么写?) What do you need for your picnic?回答 what do you need for math class?的回答 what do you need for your study?回答 what do you need for your breakfast是什么意思 what do you need for your study?翻译 What do you need for school怎么回答? what do you need for National Day怎么回答 What do you need for a good life? what do you need for buying food?的回答 what do you need( )children? We need two musicians for our School Day.Do you lkie music?What can you do What do you need for...像这样的句子,如What do you need for birthday?What do you need for a party?多说几个!必定完成啊! what do you need for school?中为什么要用for?